Hi.
Got stuck in the quest The blood of the Kings.
There are 5 bells and i need to play something but don't have any clues for combination, except Askar the Osprey mentioned on the book on the table.
I don't find any other book or notes around with help.

It refers to the painting in the collection room next to it. It's a painting of birds flying in the sky. What you need to do is match the vertical position of each crow ( from left to right ) to one of the bells ( there are 5 bells, so you'll see there are 5 possible vertical positions for the birds ) like a virtual music partition.